Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark Clyne Long, DO

Individual provider Psychiatry Physician · NPI 1821475864

Mark Clyne Long, DO is a Psychiatry Physician in Chillicothe, Ohio. Licensed in Ohio. Registered with an NPI since 2015.

Licensed in
OH
In the registry since
2015
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

17273 State Route 104
Chillicothe, OH 45601-9718
Phone: (740) 773-1141
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 34.013837 (OH)

Record details

NPI number1821475864
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedApril 29, 2015
Last updated in NPPESNovember 17, 2023
Certification dateNovember 17, 2023
Mailing address17273 State Route 104, Chillicothe, OH 45601-9718

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